Development of colorless wood via two-step delignification involving alcoholysis and bleaching with maintaining natural hierarchical structure

Journal of Wood Science

Official Journal of the Japan Wood Research Society

Table 1 Alcoholysis condition and lignin content predicted from IR spectra

Sample no.	Ethylene glycol	H₂O	97% H₂SO₄	Temperature (°C)	Lignin content predicted by IR spectra (%)
0	–	–	–	–	35.9 ± 1.99
1	0	100	0	180	35.7 ± 3.63
2	90	5	5	150	33.8 ± 1.36
3	95	2.5	2.5	140	22.6 ± 2.29
4	95	2.5	2.5	150	19.3 ± 1.54
5	95	2.5	2.5	160	26.7 ± 2.86
6	95	2.5	2.5	170	49.6 ± 4.51
7	95	2.5	2.5	180	24.3 ± 3.51
8	95	0	5	180	46.6 ± 1.65
9	96	0	4	180	45.2 ± 2.01
10	98	1	1	150	22.1 ± 5.47
11	99	0.5	0.5	110	35.5 ± 2.69
12	99	0.5	0.5	120	27.0 ± 2.90
13	99	0.5	0.5	130	22.8 ± 2.21
14	99	0.5	0.5	140	18.0 ± 3.43
15	99	0.5	0.5	150	16.2 ± 5.93
16	99	0.5	0.5	160	16.4 ± 3.26
17	99	0.5	0.5	170	16.4 ± 4.46
18	99	0.5	0.5	180	16.3 ± 4.06
19	99	1	0	150	32.6 ± 1.19
20	100	0	0	150	26.8 ± 1.91
21	100	0	0	180	45.8 ± 1.88

The values on ethylene glycol, H₂O and 97% H₂SO₄ indicate a weight ratio in reaction solvent
The value on lignin content shows the average and standard deviation calculated from 3 samples